This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A086954 #9 Jun 13 2015 00:51:07
%S A086954 1,1,4,14,38,92,214,490,1108,2474,5462,11948,25942,55978,120148,
%T A086954 256682,546134,1157804,2446678,5155498,10835284,22719146,47535446,
%U A086954 99265196,206918998,430615210,894784852,1856678570,3847574870,7963585196
%N A086954 Binomial transform of A061800.
%H A086954 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (5,-9,8,-4).
%F A086954 a(n)=0^n+n2^(n-1)+sum{k=0..floor((n-1)/3) C(n-1, 3k+2) }
%F A086954 O.g.f.: (1-x)(1-3x+5x^2)/[(1-x+x^2)(-1+2x)^2]. - _R. J. Mathar_, Apr 02 2008
%K A086954 easy,nonn
%O A086954 0,3
%A A086954 _Paul Barry_, Jul 25 2003